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Fencer Intel
high 8.8

CVE-2021-3570 json

A flaw was found in the ptp4l program of the linuxptp package.

published 5y ago modified 4mo ago also EUVD-2021-26880

cvss
8.8
version 3.1, NVD
cisa kev
Not listed
not in CISA's catalog
epss
3.0%
EPSS 3.0% chance of exploitation in 30 days, percentile 87%
public exploits
0
none known

Summary

A flaw was found in the ptp4l program of the linuxptp package. A missing length check when forwarding a PTP message between ports allows a remote attacker to cause an information leak, crash, or potentially remote code execution. The highest threat from this vulnerability is to data confidentiality and integrity as well as system availability. This flaw affects linuxptp versions before 3.1.1, before 2.0.1, before 1.9.3, before 1.8.1, before 1.7.1, before 1.6.1 and before 1.5.1.

Patch / fix

  • linuxptp_project linuxptp 1.5.1, 1.6.1, 1.7.1, 1.8.1, 1.9.3, 2.0.1, 3.1.1
  • linuxptp Debian 14, Debian 13, Debian 12 3.1-2.1

debian advisories DEBIAN-CVE-2021-3570

  • linuxptp Ubuntu 18.04 LTS 1.8-1ubuntu0.1
  • linuxptp Ubuntu 20.04 LTS 1.9.2-1ubuntu0.1
  • linuxptp Ubuntu Pro 16.04 LTS 1.6-1ubuntu0.1~esm1

ubuntu advisories UBUNTU-CVE-2021-3570

Ubuntu security data © Canonical Ltd., from https://github.com/canonical/ubuntu-security-notices via OSV; changed: normalised to fixed package versions per release. CC BY-SA 4.0

  • linuxptp RHEL 7 2.0-2.el7_9.1
  • linuxptp RHEL 8 2.0-5.el8_4.1
  • linuxptp RHEL 8.2 EUS 2.0-4.el8_2.1
  • linuxptp RHEL 8.1 EUS 2.0-4.el8_1.1

red hat advisories RHSA-2021:2657RHSA-2021:2659RHSA-2021:2658RHSA-2021:2660

  • linuxptp SLE Module for Server Applications 15 SP3 3.1.1-3.3.1
  • linuxptp SLES 15 SP1-BCL, SLES 12 SP5, SLE Module for Server Applications 15 SP2 +13 more 1.8+git65.g303b08c-3.3.1
  • linuxptp SLES for SAP 12 SP4, SLES for SAP 12 SP3, SLES 12 SP4-LTSS +8 more 1.4-15.3.1

suse advisories SUSE-SU-2021:3202-1SUSE-SU-2021:2545-1SUSE-SU-2021:2472-1SUSE-SU-2021:2443-1

  • linuxptp openSUSE Leap 15.3 3.1.1-3.3.1
  • linuxptp openSUSE Leap 15.2 1.8+git65.g303b08c-lp152.4.3.1

opensuse advisories openSUSE-SU-2021:3202-1openSUSE-SU-2021:1102-1

  • linuxptp Rocky Linux 8 2.0-5.el8_4.1

rocky linux advisories RLSA-2021:2660

Is CVE-2021-3570 in your stack? Fencer shows which of your repositories are affected as soon as an advisory lands, and opens the fix as a pull request.

Check with Fencer

Vendor advisories

What the vendors themselves say about their products: affected, fixed or not affected, and what to do.

red hat product security vex CVE-2021-3570 updated cvss 8.8

linuxptp: missing length check of forwarded messages

  • Red Hat Enterprise Linux 6 linuxptp
    affected: workaround, no fix planned “Out of support scope”
  • Red Hat Enterprise Linux AppStream (v. 8) linuxptp 2.0-5.el8_4.1
    fixed: vendor fix RHSA-2021:2660
  • Red Hat Enterprise Linux AppStream EUS (v. 8.1) linuxptp 2.0-4.el8_1.1
    fixed: vendor fix RHSA-2021:2659
  • Red Hat Enterprise Linux AppStream EUS (v. 8.2) linuxptp 2.0-4.el8_2.1
    fixed: vendor fix RHSA-2021:2657
  • Red Hat Enterprise Linux Client (v. 7) linuxptp 2.0-2.el7_9.1 Red Hat Enterprise Linux Server (v. 7) linuxptp 2.0-2.el7_9.1 Red Hat Enterprise Linux Workstation (v. 7) linuxptp 2.0-2.el7_9.1
    fixed: vendor fix RHSA-2021:2658
  • Red Hat Enterprise Linux 9 linuxptp
    not affected: vulnerable code not present

Red Hat CSAF VEX © Red Hat, Inc., from https://security.access.redhat.com/data/csaf/v2/vex/; changed: reduced to product statuses and remediations. CC BY 4.0 · csaf

Exploit prediction

2.96% chance of exploitation in the next 30 days, higher than 87% of all scored CVEs (FIRST EPSS, 2026-11-09).

CVSS scores

assigned by version score vector
NVD 3.1 8.8 CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
NVD 2.0 8.0 AV:N/AC:L/Au:S/C:P/I:P/A:C

Affected products

  • n/a linuxptp

Classification

Weakness
  • CWE-119 Improper Restriction of Operations within the Bounds of a Memory Buffer
  • CWE-787 Out-of-bounds Write

References

Sources

Fencer Intel keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.